linux-kernel - Re: [PATCH v2 1/2] kunit: add macro to allow conditionally exposing static symbols to tests

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Date:   Tue, 6 Dec 2022 17:40:44 +0800
From:   David Gow <davidgow@...gle.com>
To:     Rae Moar <rmoar@...gle.com>
Cc:     brendanhiggins@...gle.com, dlatypov@...gle.com,
        john.johansen@...onical.com, skhan@...uxfoundation.org,
        tales.aparecida@...il.com, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        apparmor@...ts.ubuntu.com
Subject: Re: [PATCH v2 1/2] kunit: add macro to allow conditionally exposing
 static symbols to tests

On Tue, Dec 6, 2022 at 5:51 AM Rae Moar <rmoar@...gle.com> wrote:
>
> Create two macros:
>
> VISIBLE_IF_KUNIT - A macro that sets symbols to be static if CONFIG_KUNIT
> is not enabled. Otherwise if CONFIG_KUNIT is enabled there is no change to
> the symbol definition.
>
> EXPORT_SYMBOL_IF_KUNIT(symbol) - Exports symbol into
> EXPORTED_FOR_KUNIT_TESTING namespace only if CONFIG_KUNIT is enabled. Must
> use MODULE_IMPORT_NS(EXPORTED_FOR_KUNIT_TESTING) in test file in order to
> use symbols.
>
> Signed-off-by: Rae Moar <rmoar@...gle.com>
> Reviewed-by: John Johansen <john.johansen@...onical.com>
> Reviewed-by: David Gow <davidgow@...gle.com>
> ---
>
> Changes since v1:
>  - Separated the documentation comments for macros.
>  - Changed copyright date and author for new header file.
>

This still looks good to me, thanks!

Reviewed-by: David Gow <davidgow@...gle.com>

Cheers,
-- David


>  include/kunit/visibility.h | 33 +++++++++++++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
>  create mode 100644 include/kunit/visibility.h
>
> diff --git a/include/kunit/visibility.h b/include/kunit/visibility.h
> new file mode 100644
> index 000000000000..0dfe35feeec6
> --- /dev/null
> +++ b/include/kunit/visibility.h
> @@ -0,0 +1,33 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * KUnit API to allow symbols to be conditionally visible during KUnit
> + * testing
> + *
> + * Copyright (C) 2022, Google LLC.
> + * Author: Rae Moar <rmoar@...gle.com>
> + */
> +
> +#ifndef _KUNIT_VISIBILITY_H
> +#define _KUNIT_VISIBILITY_H
> +
> +#if IS_ENABLED(CONFIG_KUNIT)
> +    /**
> +     * VISIBLE_IF_KUNIT - A macro that sets symbols to be static if
> +     * CONFIG_KUNIT is not enabled. Otherwise if CONFIG_KUNIT is enabled
> +     * there is no change to the symbol definition.
> +     */
> +    #define VISIBLE_IF_KUNIT
> +    /**
> +     * EXPORT_SYMBOL_IF_KUNIT(symbol) - Exports symbol into
> +     * EXPORTED_FOR_KUNIT_TESTING namespace only if CONFIG_KUNIT is
> +     * enabled. Must use MODULE_IMPORT_NS(EXPORTED_FOR_KUNIT_TESTING)
> +     * in test file in order to use symbols.
> +     */
> +    #define EXPORT_SYMBOL_IF_KUNIT(symbol) EXPORT_SYMBOL_NS(symbol, \
> +           EXPORTED_FOR_KUNIT_TESTING)
> +#else
> +    #define VISIBLE_IF_KUNIT static
> +    #define EXPORT_SYMBOL_IF_KUNIT(symbol)
> +#endif
> +
> +#endif /* _KUNIT_VISIBILITY_H */
> --
> 2.39.0.rc0.267.gcb52ba06e7-goog
>

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